Posted By
gerliczer
on 2016-01-31
10:14:02
|  Re: IC 6523 TIA info
The mainboard drawing shows that it is connected to the Output Enable signal of the U6 Gate Array. Which in turn is connected mostly to the U11 Hybrid IC. That controls not only the R/W head but also the stepper motor. I think this means that the gate array initiated state changes of the hybrid will occur when this line is raised to high. Which is not limited to selecting reading or writing mode. I hope somebody actually knowing 1551s could confirm or deny this.
What are the conflicting information sources?
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